The only time it worked was when Kenyan communists took over a socdem party, and the very big difference between their entryism and virtually every other instance of entryism is that Kenya had banned communist parties, so there was no way to openly organize as communists. After Kenya lifted the ban on communist parties, there was a line struggle between social democrats who wanted the Social Democratic Party to stay a social democratic party and communists who used the Social Democratic Party to get around the ban on communist parties with the communists winning out. Once they kicked the socdems to the curb, they changed the party's name to the Communist Party of Kenya.